No tv listing on sky hd box but after a few seconds the channel come on.

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No tv listing on sky hd box but after a few seconds the channel come on.

i have no tv listing on sky hd box but the channels work great after a few seconds with no break up.
I have tried software update ,check default transponder ,unplugged it for 1/2 half etc still the same this happened after we had a power cut .
Any idea how to fix this please ?
Thanks